Pressurized fluidtight system for throttle valves



PRESSURIZED FLUIDTIGHT SYSTEM FOR THROTTLE VALVES Filed 001'.. 24, 1965 l A 4 mum mil/num:

Mfr/Wax United States Patent C) PRESSURIZED FLUIDTIGHT SYSTEM FOR THROTTLE VALVES Marie Charles Emile Henrion, 11 Rue Hermite, Nancy, France Filed Oct. 24, 1965, Ser. No. 504,364

Claims priority, applicgation France, Nov. 24, 1964,

3 claims. (Cl. 251-173) ABSTRACT F THE DISCLOSURE A iluidtight chamber fitted within a cylindrical recess in the casing of a throttle valve between the wall of the recess and the throttle valve in its closed operative posi-- I have already described in my specification 3,034,760 a valve system wherein the throttle or butterlly valve engages throughout its periphery the shell or casing of the valve through the agency of a thin ferrule subjected to the pressure of the oil delivered by a jack. To this end, there is provided inside the inner wall of the shell of the valve an annular recess adapted to receive the oil and closed by the ferrule on the side of the recess facing the location to be occupied by the throttle valve. T-he chamber thus obtained communicates with the jack, the operation of which is started when the throttle valve -has reached its closedA position. This leads to a rise in the oil pressure inside the recess and to an elastic deformation of the ferrule, the curvature of which increases inwardly so as to engage the periphery of the throttle valve and to produce thus the ldesired fluidtightness for the latter in its closed position.

My invention -has for its lobject an arrangement relying on the same idea, but of an easier and more economical structure while it ensures a larger deformation of the ferrule for a same pressure of oil and consequently fluidtightness is easier to obtain with this novel arrangement.

To this end, the oil pressure is exerted inside a bladeshaped recess formed by the narrow gap appearing between two coaxial ferrules urged against each other and welded together along their cooperating edges. The deformable ring-shaped chamber obtained thereby is housed inside an annular recess formed as precedingly inside the valve shell or casing, said recess being connected with the jack in the manner already referred to.

I will now describe a preferred embodiment of my invention, given by way of example, reference being made to the accompanying drawings wherein:

FIG. 1 is a general diagram -of the fluidtight arrangement.

FIG. 2 is a sectional view on a larger scale of the butterfly or throttle valve in its closed position, the peripheral bearing surface of which valve is rendered fluidtight 4by the clamping action obtained through the incurvation given to the deformable ring-shaped chamber which is filled with oil under pressure and extends thus between the valve and its casing.

FIG. 3 is a cross-section on a larger scale of the deformable ring-shaped chamber when subjected to oil pressure.

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The principle of the arrangement appears clearly from inspection of FIG. l which shows the throttle valve 1 edgewise in its position closing the shell or casing 2 of the valve. In registry with the periphery of the throttle valve, there is provided an annular recess 3 formed in the free end of the bore defined by the valve shell and wherein is located a deformable annular chamber 4 fed with the oil passing out of the jack 5 through the channel 6.

FIG. 2 illustrates with further detail the pivotal link system 7 which allows bringing the throttle valve from its closed position 1 into its open position illustrated in dot-and-dash lines at 1'.

As to the deformable annular chamber 4, it is constituted by two transversely incurved annular metal sheets or ferrules 8 facing each other through their concavities and the edges of which facing each other are welded together as illustrated at a and b. The thin blade-shaped chamber 4 thus obtained is connected with the pipe 6. When the pressure of oil increases in the chamber 4, the two ferrules are deformed and bulge in opposite directions, whereby the outer ferrule engages the inner wall of the valve shell and urges towards the axis of the casing the inner ferrule which is deformed in the opposite direction and engages energetically the periphery of the throttle valve in its closed position.

It is of advantage to provide a tore-shaped packing 9 made Iof neoprene for instance throughout the periphery of the Ideformable annular chamber so as to ensure fluidtightness between the latter and the wall of the bore in the valve shell with a view to opposing any possible leak of the fluid carried inside said valve shell between the upstream and the downstream side of the closed throttle valve. Furthermore, an annulus or circlips is provided at 10 so as to lock the deformable annular chamber in position and to prevent it from passing out of the annular recess inside which it is housed.

It is apparent that the arrangement proposed ensures a larger deformation of the ferrules when compared with my prior arrangement referred to hereinabove, and allows a more eilicient operation of the deformable annular chamber, While allowing a lesser accuracy in the machining. The deformation of the inner surface of the annular chamber is more important, under otherwise similar conditions, by reason of the double deformation provided for the annular deformable chamber.

Lastly, since the deformable chamber is no longer welded to the valve body or shell, said shell can be made of cast iron, bronze or any other suitable material instead of being made as precedingly of weldable steel, and this implies a substantial saving in the execution of the arrangement and leads to further possible applications.

Of course, the embodiment described is given solely by way of example and should not be construed as limiting the scope of the invention, as dened in the accompanying claims; in particular, the fluid serving for the ination of the deformable annular chamber may be a fluid dilferent from oil.

What I claim is:

1. In combination with a circular throttle valve adapted to pivot within its casing round an axis extending diametrically across a cylindrical recess formed in said casing between short transverse annular walls, the provision of a fluidtight system comprising a chamber including two outwardly convex annular ferrules engaging respectively the bottom of the recess and the throttled valve in its operative position and the cooperating peripheral edges of which are welded together and engage slidingly the corresponding transverse walls of the recess and an outer medial reinforcement of the outer ferrule facing prising a ring forming the outer transverse wall of the the bottom of the recess and a pipe adapted to feed uid recess in vthe casing. into 1said clhamber todlina it and tlerebdmale htle References Cited erru es bu ge outwar y w le their e ges s 1 e s 1g ty UNITED STATES PATENTS away from the bottom of the recess. 5

2. A uidtight system as claimed in claim 1, compris- 118131126 7/1931 Sheppard 251-*173 ing furthermore a packing tted between the bottom of 13347870 12/1931 Rogers 251--173 the recess and the medial reinforcement of the outer 2673708 3/1954 Dank? 251173 ferrule 3,034,760 5/ 1962 IHenrion 251-173 3. A uidfight system as claimed in claim 1, com- 10 CLARENCE R. GORDON, Primary Examiner. 

